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Evidence for phase transitions of aqueous gelatin gels in a centrifugal field

  • W. Borchard
  • H. Cölfen
  • D. Kisters
  • A. Straatmann
Conference paper
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 119)

Abstract

Experimental findings of turbid zones in the schlieren patterns of gels in a centrifugal field are explained by a demixing of gels into a highly swollen gel coexisting with a collapsed gel. The thermodynamic analysis of a slightly cross-linked aqueous gel at relatively low centrifugal field, which remains clear, leads to the conclusion that the system is close to its stability limit. A procedure is proposed to show how the stability limits may be extrapo lated by means of ultracentrifugal measurements. The phenomena are separated into a transient and a permanent demixing. The permanent demixing has been qualitatively explained by use of state diagrams predicted recently by Khokhlov and coworkers, Ilavsky and also by Moerkerke et al.

Key words

Gel Phase transitions Demixing Turbidity Ultracentrifugation 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • W. Borchard
    • 1
  • H. Cölfen
    • 2
  • D. Kisters
    • 1
  • A. Straatmann
    • 1
  1. 1.Institut für Physikalische und Theoretische Chemie der Gerhard-Mercator-Universität DuisburgDuisburgGermany
  2. 2.Max-Planck-Institut für Kolloid- und GrenzflächenforschungPotsdamGermany

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